Temel, SedatŞahan, TunçarMucuk, Osman2021-06-092021-06-0920200354-5180https:/dx.doi.org/10.2298/FIL2006755Thttps://hdl.handle.net/20.500.12451/8096*Şahan, Tunçar ( Aksaray, Yazar )The purpose of this paper is to obtain the notion of crossed module over group-groupoids con-sidering split extensions and prove a categorical equivalence between these types of crossed modules and double group-groupoids. This equivalence enables us to produce various examples of double groupoids. We also prove that crossed modules over group-groupoids are equivalent to crossed squares.eninfo:eu-repo/semantics/openAccessCrossed ModuleCrossed SquareDouble Group-GroupoidGroup-GroupoidArticle3461755176910.2298/FIL2006755TQ3WOS:000603450300001Q3